#include <bits/stdc++.h>
using namespace std;

int main()
{
	int n;
	cin >> n;
	vector<int> x(n);
	vector<int> r(n);
	for(int i = 0; i < n; i++)
	{
		cin >> x[i] >> r[i];
		x[i] += 200000;
		x[i] *= 2;
		r[i] *= 2;
	}
	
	vector<int> rui(800001);
	for(int i = 0; i < n; i++)
	{
		rui[x[i] - r[i] + 1]++;
		rui[x[i] + r[i]]--;
	}
	
	for(int i = 1; i <= 800000; i++) rui[i] += rui[i - 1];
	sort(rui.begin(), rui.end(), greater<int>());
	cout << rui[0] << endl;
	return 0;
}